Index: firmware/App/Controllers/ConcentratePumps.c
===================================================================
diff -u -rcbd3f0ecc32e6f3cb318836da09cfab6fd1e8dc7 -rdf89590f6b810b2c82a84156c9f010ccadecf7cb
--- firmware/App/Controllers/ConcentratePumps.c	(.../ConcentratePumps.c)	(revision cbd3f0ecc32e6f3cb318836da09cfab6fd1e8dc7)
+++ firmware/App/Controllers/ConcentratePumps.c	(.../ConcentratePumps.c)	(revision df89590f6b810b2c82a84156c9f010ccadecf7cb)
@@ -991,8 +991,10 @@
  *************************************************************************/
 static void monitorPumpSpeed( CONCENTRATE_PUMPS_T pumpId, ALARM_ID_T alarm )
 {
-    F32 cpTargetSpeed   = concentratePumps[ pumpId ].currentPumpSpeed;
-    F32 cpError         = fabs( fabs( getMeasuredPumpSpeedMLPM( pumpId ) ) - cpTargetSpeed );
+    // NOTE: make all the values absolute to cover both negative and positive target/measured speeds
+    F32 cpTargetSpeed   = fabs( concentratePumps[ pumpId ].currentPumpSpeed );
+    F32 cpMeasSpeed     = fabs( getMeasuredPumpSpeedMLPM( pumpId ) );
+    F32 cpError         = fabs( cpMeasSpeed - cpTargetSpeed );
     BOOL isCpSpeedOut   = FALSE;
     F32 tolerance       = CONCENTRATE_PUMP_SPD_OUT_OF_RANGE_TOL_WHEN_SLOW_MLPM;
     DG_OP_MODE_T opMode = getCurrentOperationMode();